# Field ## Content [**DsPdfJS API v9.1.3**](../README) *** [DsPdfJS API](../globals) / Field # Class: Field Defines AcroForm field. ## Extends - [`ObjectBase`](ObjectBase) ## Extended by - [`CheckBoxField`](CheckBoxField) - [`ChoiceField`](ChoiceField) - [`PushButtonField`](PushButtonField) - [`RadioButtonField`](RadioButtonField) - [`SignatureField`](SignatureField) - [`TextField`](TextField) ## Accessors ### alternateName #### Get Signature > **get** **alternateName**(): `string` \| `null` Gets or sets an alternate field name to be used in place of the actual field name wherever the field must be identified in the user interface (such as in error or status messages referring to the field). This text is also useful when extracting the document's contents in support of accessibility to users with disabilities or for other purposes. ##### Returns `string` \| `null` #### Set Signature > **set** **alternateName**(`value`): `void` Gets or sets an alternate field name to be used in place of the actual field name wherever the field must be identified in the user interface (such as in error or status messages referring to the field). This text is also useful when extracting the document's contents in support of accessibility to users with disabilities or for other purposes. ##### Parameters ###### value `string` | `null` ##### Returns `void` *** ### calculationIndex #### Get Signature > **get** **calculationIndex**(): `number` Gets or sets an index that is used to determine the field's calculation order. Fields with lower indices are calculated before fields with higher indices. If several fields have the same CalculationIndex, the calculation order is determined by the order of fields in the collection. [recalculateValue](#recalculatevalue) can be used to specify JavaScript that is used to calculate the field's value. ##### Returns `number` #### Set Signature > **set** **calculationIndex**(`value`): `void` Gets or sets an index that is used to determine the field's calculation order. Fields with lower indices are calculated before fields with higher indices. If several fields have the same CalculationIndex, the calculation order is determined by the order of fields in the collection. [recalculateValue](#recalculatevalue) can be used to specify JavaScript that is used to calculate the field's value. ##### Parameters ###### value `number` ##### Returns `void` *** ### children #### Get Signature > **get** **children**(): [`FieldCollection`](FieldCollection) Gets the list of child fields. ##### Returns [`FieldCollection`](FieldCollection) *** ### defaultValue #### Get Signature > **get** **defaultValue**(): `string` \| `number` \| `boolean` \| `number`[] \| `null` Gets or sets the field's default value. ##### Returns `string` \| `number` \| `boolean` \| `number`[] \| `null` #### Set Signature > **set** **defaultValue**(`value`): `void` Gets or sets the field's default value. ##### Parameters ###### value `string` | `number` | `boolean` | `number`[] | `null` ##### Returns `void` *** ### doc #### Get Signature > **get** **doc**(): [`PdfDocument`](PdfDocument) \| `null` Gets the [PdfDocument](PdfDocument) owning this field. ##### Returns [`PdfDocument`](PdfDocument) \| `null` *** ### export #### Get Signature > **get** **export**(): `boolean` Gets or sets a value indicating whether the field must not be exported by a [ActionSubmitForm](ActionSubmitForm) action. ##### Returns `boolean` #### Set Signature > **set** **export**(`value`): `void` Gets or sets a value indicating whether the field must not be exported by a [ActionSubmitForm](ActionSubmitForm) action. ##### Parameters ###### value `boolean` ##### Returns `void` *** ### formatValue #### Get Signature > **get** **formatValue**(): [`ActionJavaScript`](ActionJavaScript) \| `null` Gets or sets a JavaScript action to be performed before the field is formatted to display its current value. This action can modify the field's value before formatting. ##### Returns [`ActionJavaScript`](ActionJavaScript) \| `null` #### Set Signature > **set** **formatValue**(`value`): `void` Gets or sets a JavaScript action to be performed before the field is formatted to display its current value. This action can modify the field's value before formatting. ##### Parameters ###### value [`ActionJavaScriptProperties`](../type-aliases/ActionJavaScriptProperties) | [`ActionJavaScript`](ActionJavaScript) | `null` ##### Returns `void` *** ### id #### Get Signature > **get** **id**(): `number` Gets the reference to the object. ##### Returns `number` #### Inherited from [`ObjectBase`](ObjectBase).[`id`](ObjectBase#id) *** ### justification #### Get Signature > **get** **justification**(): [`VariableTextJustification`](../enumerations/VariableTextJustification) \| `null` Gets or sets the justification to be used in displaying the field's text. Note that this field is used only if [WidgetAnnotation#justification](WidgetAnnotation#justification) is not specified. ##### Returns [`VariableTextJustification`](../enumerations/VariableTextJustification) \| `null` #### Set Signature > **set** **justification**(`value`): `void` Gets or sets the justification to be used in displaying the field's text. Note that this field is used only if [WidgetAnnotation#justification](WidgetAnnotation#justification) is not specified. ##### Parameters ###### value [`VariableTextJustification`](../enumerations/VariableTextJustification) | `null` ##### Returns `void` *** ### keyPress #### Get Signature > **get** **keyPress**(): [`ActionJavaScript`](ActionJavaScript) \| `null` Gets or sets a JavaScript action to be performed when the user types a keystroke into a text field or combo box or modifies the selection in a scrollable list box. This action can check the keystroke for validity and reject or modify it. ##### Returns [`ActionJavaScript`](ActionJavaScript) \| `null` #### Set Signature > **set** **keyPress**(`value`): `void` Gets or sets a JavaScript action to be performed when the user types a keystroke into a text field or combo box or modifies the selection in a scrollable list box. This action can check the keystroke for validity and reject or modify it. ##### Parameters ###### value [`ActionJavaScriptProperties`](../type-aliases/ActionJavaScriptProperties) | [`ActionJavaScript`](ActionJavaScript) | `null` ##### Returns `void` *** ### mappingName #### Get Signature > **get** **mappingName**(): `string` \| `null` Gets or sets the mapping name to be used when exporting interactive form field data from the document. ##### Returns `string` \| `null` #### Set Signature > **set** **mappingName**(`value`): `void` Gets or sets the mapping name to be used when exporting interactive form field data from the document. ##### Parameters ###### value `string` | `null` ##### Returns `void` *** ### name #### Get Signature > **get** **name**(): `string` \| `null` Gets or sets the field's name. ##### Returns `string` \| `null` #### Set Signature > **set** **name**(`value`): `void` Gets or sets the field's name. ##### Parameters ###### value `string` ##### Returns `void` *** ### om #### Get Signature > **get** **om**(): [`ObjectManager`](ObjectManager) Gets the owner [ObjectManager](ObjectManager) instance. ##### Returns [`ObjectManager`](ObjectManager) #### Inherited from [`ObjectBase`](ObjectBase).[`om`](ObjectBase#om) *** ### owner #### Get Signature > **get** **owner**(): [`FieldCollection`](FieldCollection) \| `null` Gets the [FieldCollection](FieldCollection) containing this field. ##### Returns [`FieldCollection`](FieldCollection) \| `null` *** ### parent #### Get Signature > **get** **parent**(): `Field` \| `null` Gets the parent field. ##### Returns `Field` \| `null` *** ### readOnly #### Get Signature > **get** **readOnly**(): `boolean` Gets or sets a value indicating whether the user may not change the value of the field. Any associated widget annotations will not interact with the user; that is, they will not respond to mouse clicks or change their appearance in response to mouse motions. This flag is useful for fields whose values are computed or imported from a database. ##### Returns `boolean` #### Set Signature > **set** **readOnly**(`value`): `void` Gets or sets a value indicating whether the user may not change the value of the field. Any associated widget annotations will not interact with the user; that is, they will not respond to mouse clicks or change their appearance in response to mouse motions. This flag is useful for fields whose values are computed or imported from a database. ##### Parameters ###### value `boolean` ##### Returns `void` *** ### recalculateValue #### Get Signature > **get** **recalculateValue**(): [`ActionJavaScript`](ActionJavaScript) \| `null` Gets or sets a JavaScript action to be performed to recalculate the value of this field when that of another field changes. ##### Returns [`ActionJavaScript`](ActionJavaScript) \| `null` #### Set Signature > **set** **recalculateValue**(`value`): `void` Gets or sets a JavaScript action to be performed to recalculate the value of this field when that of another field changes. ##### Parameters ###### value [`ActionJavaScriptProperties`](../type-aliases/ActionJavaScriptProperties) | [`ActionJavaScript`](ActionJavaScript) | `null` ##### Returns `void` *** ### required #### Get Signature > **get** **required**(): `boolean` Gets or sets a value indicating whether the field must have a value at the time it is exported by a [ActionSubmitForm](ActionSubmitForm) action. ##### Returns `boolean` #### Set Signature > **set** **required**(`value`): `void` Gets or sets a value indicating whether the field must have a value at the time it is exported by a [ActionSubmitForm](ActionSubmitForm) action. ##### Parameters ###### value `boolean` ##### Returns `void` *** ### value #### Get Signature > **get** **value**(): `string` \| `number` \| `boolean` \| `number`[] \| `null` Gets or sets the field's value. ##### Returns `string` \| `number` \| `boolean` \| `number`[] \| `null` #### Set Signature > **set** **value**(`value`): `void` Gets or sets the field's value. ##### Parameters ###### value `string` | `number` | `boolean` | `number`[] | `null` ##### Returns `void` *** ### valueChanged #### Get Signature > **get** **valueChanged**(): [`ActionJavaScript`](ActionJavaScript) \| `null` Gets or sets a JavaScript action to be performed when the field's value is changed. This action can check the new value for validity. ##### Returns [`ActionJavaScript`](ActionJavaScript) \| `null` #### Set Signature > **set** **valueChanged**(`value`): `void` Gets or sets a JavaScript action to be performed when the field's value is changed. This action can check the new value for validity. ##### Parameters ###### value [`ActionJavaScriptProperties`](../type-aliases/ActionJavaScriptProperties) | [`ActionJavaScript`](ActionJavaScript) | `null` ##### Returns `void` *** ### widgets #### Get Signature > **get** **widgets**(): [`FieldWidgetCollection`](FieldWidgetCollection) Gets the list of widget annotations associated with this field. ##### Returns [`FieldWidgetCollection`](FieldWidgetCollection) ## Methods ### free() > **free**(): `void` Detaches the object from the [ObjectManager](ObjectManager) and deallocates its memory, if possible. #### Returns `void` #### Inherited from [`ObjectBase`](ObjectBase).[`free`](ObjectBase#free) *** ### rebind() > **rebind**(`omTo`): `void` Rebinds the object from the current [ObjectManager](ObjectManager) to the specified one. #### Parameters ##### omTo [`ObjectManager`](ObjectManager) The new [ObjectManager](ObjectManager) for the object. #### Returns `void` #### Inherited from [`ObjectBase`](ObjectBase).[`rebind`](ObjectBase#rebind)